Monazite-(Ce) (color change ''butterfly''-twinned crystals)

Siglo XX Mine, Llallagua, Bustillos Province, Potosi Department, Bolivia
Small Cabinet, 6.7 x 4.2 x 2.1 cm
Start Time: 11/11/2021 8:00:00 pm (CST)
End Time: 11/18/2021 6:45:00 pm (CST)
Auction Closed
Winning Bid: $130

Item Description

Monazite gets its name from the Greek word "monazein", which means "to be alone", in allusion to its isolated crystals and their rarity when first found. Monazite is usually found in granitic pegmatites, but these crystals are found in hydrothermal tin veins where is an absolute absence of Thorium (usually a trace element in Monazite). This pieces features ridiculously rare, sharp, lustrous, translucent, orange-pink crystals of Monazite-(Ce) measuring up to 5 mm (!) sitting on prismatic, gemmy colorless Quartz with minor twinned crystals of black Cassiterite on matrix. These Monazite twins are some of the most distinct and impressive twinned Monazite crystals I have seen from Bolivia. The crystals actually perform a color change in different lighting ranging from orange-pink to a white/yellow depending upon the light source. This specimen has some very good sized crystals for the locality, and this piece came out of the ground over 10 years ago. This piece is from the same mine from which this material was discovered along the Contacto and San Jose veins in this mine and was first described by Sam Gordon and Mark Bandy. It is so unbelievably rare to find matrix specimens of Monazite-(Ce) from any locality in Bolivia or anywhere else in the world. This species is often dark and opaque from most localities and rarely with a more pleasing color like these.

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Bidding History

Bid Amount Bid Time
$130 11/18/2021 6:24:24 pm (CST)
$120 11/18/2021 6:24:24 pm (CST)
$110 11/18/2021 5:12:31 pm (CST)
$100 11/18/2021 5:12:31 pm (CST)
$80 11/18/2021 4:33:09 pm (CST)
$70 11/18/2021 4:32:56 pm (CST)
$60 11/18/2021 4:32:56 pm (CST)
$50 11/18/2021 4:32:46 pm (CST)
$45 11/18/2021 4:32:46 pm (CST)
$40 11/18/2021 3:54:19 pm (CST)
$35 11/18/2021 3:50:23 pm (CST)
$30 11/18/2021 3:50:23 pm (CST)
$20 * 11/18/2021 12:25:09 am (CST)
$20 * 11/18/2021 12:25:09 am (CST)
$15 11/17/2021 10:29:45 am (CST)
$10 11/12/2021 3:31:23 pm (CST)
* Proxy Bid Battle: In the event of two customers inputting matching proxy bids, the leading bid goes to the earliest of the two proxy bids. Tie winners are shown in bold.